/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.module.zxing.utils;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;

import com.google.zxing.Result;
import com.module.zxing.R;
import com.module.zxing.activity.CaptureActivity;
import com.module.zxing.camera.CameraManager;
import com.module.zxing.decode.DecodeQRCodeThread;
import com.module.zxing.decode.DecodeThread;
import com.module.zxing.widget.QRCodeView;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public class QRCodeHandler extends Handler {

	private enum State {

		PREVIEW, SUCCESS, DONE

	}

	private final QRCodeView qrCodeView;

	private final DecodeQRCodeThread decodeThread;

	private final CameraManager cameraManager;

	private State state;

	public QRCodeHandler(QRCodeView qrCodeView, CameraManager cameraManager, int decodeMode) {

		this.qrCodeView = qrCodeView;

		this.cameraManager = cameraManager;

		decodeThread = new DecodeQRCodeThread(qrCodeView, decodeMode);

		decodeThread.start();

		state = State.SUCCESS;

		cameraManager.startPreview();

		restartPreviewAndDecode();

	} 

	@Override
	public void handleMessage(Message message) {
		if(message.what == R.id.restart_preview){
			restartPreviewAndDecode();
		}else if(message.what == R.id.decode_succeeded){
			state = State.SUCCESS;
			Bundle bundle = message.getData();
			qrCodeView.handleDecode((Result) message.obj, bundle);
		}else if(message.what == R.id.decode_failed){
			state = State.PREVIEW;
			cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
		}else if(message.what == R.id.return_scan_result){
			Log.e("QRCodeHandler", (String) message.obj);
//			Toast.makeText(qrCodeView.getContext(), (String) message.obj, Toast.LENGTH_LONG);
//			qrCodeView.setResult(Activity.RESULT_OK, (Intent) message.obj);
//			activity.finish();
		}
	}

	public void quitSynchronously() {
		state = State.DONE;
		cameraManager.stopPreview();
		Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
		quit.sendToTarget();
		try {
			// Wait at most half a second; should be enough time, and onPause()
			// will timeout quickly
			decodeThread.join(500L);
		} catch (InterruptedException e) {
			// continue
		}

		// Be absolutely sure we don't send any queued up messages
		removeMessages(R.id.decode_succeeded);
		removeMessages(R.id.decode_failed);
	}

	private void restartPreviewAndDecode() {
		if (state == State.SUCCESS) {
			state = State.PREVIEW;
			cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
		}
	}

}
